Why is adding soap to neem and water mixture important? Oil and water don't mix well, if you let them settle you will notice them separating. Yes, you could treat your plant like this. However, if you add a few drops of dish soap, a process called emulsifications happens, where the liquids mix together well and the treatment is more effective.⠀ I won't fully get rid of spider mites with only 1 treatment, but i will diminish the population and keep it in check for a few weeks. ⠀ ⠀ Turn off grow l